javascript - How can I throw an exception out of an AJAX call and out of a function? -

if have jquery ajax call within function:

function callpagemethod(methodname, parameters) {     var pagepath = window.location.href;      $.ajax({         type: "post",         url: pagepath + "/" + methodname,         contenttype: "application/json; charset=utf-8",         data: parameters,         datatype: "json",         success: function (response) {             alert("ajax successful!");         },         error: function (response) {              // line not working!             throw response.responsetext;         }     }); } // end of function 

...i getting error in visual studio 2010:

microsoft jscript runtime error: exception thrown , not caught.

seems if problem not related visual studio though, particular javascript.

example, can declare variable in function before $.ajax call, assign in error:, , throw out of function after $.ajax call no problems...



how can throw error out of nested function in way? want catch error outside of function if possible.

so, here possible solutions have found:

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   1 -- assign variable error value, , throw after $.ajax call:

function callpagemethod(methodname, parameters) {     var errorvalue = null;      $.ajax({         ...         ...         ...         error: function (response) {             errorvalue = response.responsetext;         }     });      if (errorvalue != null) {         throw errorvalue;     } } 

   2 -- make $.ajax call synchronous:

function callpagemethod(methodname, parameters) {     var errorvalue = null;      $.ajax({         ...         ...         ...         async: false,         error: function (response) {              // works:             throw response.responsetext;         }     }); }